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The primary thing you would need is a Display PostScript Server. These
may be pretty hard to get, as Display PostScript is essentially
discontinued...

Aandi Inston

Thank you for your reply, Aandi Inston. But what do people use now in order to display postscript files onto the screen? Is Ghostscript the only possibility? Or is there another way of showing a result to the screen? And doesn't Ghostscript have to use Display PostScript as well?

GhostScript does not use Display PostScript. It contains a PostScript
interpreter of its own (that's why it has hundreds of thousands of
lines of code).  There never was a Display PostScript for Windows, so
far as I know, the TCP/IP support wasn't advanced enough at the time
DPS was being promoted.

Another approach is to use Acrobat Distiller to convert the PostScript
to PDF, and then use Acrobat Reader to view the file.

There are other PostScript interpreters that can display on screen.
GhostScript is free for non-commercial use; all others are not.  In
roughly increasing order of cost you have GhostScript, Jaws,
Harlequin, Adobe CPSI.  At the top end you will be looking at 6-7
figure licensing fees and in all cases for commercial use per-copy
royalties.

Aandi Inston

Thanks once more, but I'm still a bit in the dark. What I want to do is manipulate a postscript file from a database application, which can use graphic output as its user interface. I have written systems which produce postscript code as output over the last fourteen years, but always to be output to a printer. I thought that if I had the psops.h (or any other necessary headers) that I could write a C program, which I can then call with a script, in order to manipulate the graphic (with which the user interacts as the input interface).

I'm not clear on a particular point here. You say " I thought that if
I had the psops.h..." Do you mean that you do have a system (perhaps
an old Unix system) that has Display PostScript?

You clearly need some kind of PostScript interpreter, in order to read
your PostScript files. Up to now you have been dealing only with the
interpreter inside a printer.

Aandi Inston